????????
      +---------
TWTLM | TMMRWEWF
       -TWTLM
        =====
         PFTNE
        -WNPEL
         =====
          NNRPW
         -LLXMR
          =====
          TUXNFF
         -TULHQE
          ======
          ??????

base: 13
letters: EFHLMNPQRTUWX
difficulty: medium